It says enzymes in their stomachs are able to kill botulinal toxins, which is a good thing.

However, I also remember reading elsewhere that they will gather in one place because they're social, so I'm sure it's no fun if that place is your house!

"Turkey Vultures are scavengers and sanitarians ― they help recycle the bodies of dead animals but also sanitize the area for us. The corrosive enzymes in their stomachs and sophisticated immune systems are able to kill a number of deadly organisms, including salmonella and bacteria that cause anthrax, hog cholera, and botulinal toxins. At present, Turkey Vultures are the only animal in the world known to have this ability. If we did not have Turkey Vultures, we would be overrun with disease and polluted waters. This very scenario occurred in India, South Africa and Spain when vulture populations plummeted due to poisoning, shootings and an avian virus. Realizing they needed the vultures, the governments of these countries established captive breeding programs to reestablish the populations and bring the environment back into balance."